4 * Copyright (C) International Business Machines Corp., 2002,2008
5 * Author(s): Steve French (sfrench@us.ibm.com)
7 * Common Internet FileSystem (CIFS) client
9 * This library is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as published
11 * by the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
17 * the GNU Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this library; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 /* Note that BB means BUGBUG (ie something to fix eventually) */
26 #include <linux/module.h>
28 #include <linux/mount.h>
29 #include <linux/slab.h>
30 #include <linux/init.h>
31 #include <linux/list.h>
32 #include <linux/seq_file.h>
33 #include <linux/vfs.h>
34 #include <linux/mempool.h>
35 #include <linux/delay.h>
36 #include <linux/kthread.h>
37 #include <linux/freezer.h>
38 #include <linux/namei.h>
39 #include <linux/random.h>
43 #define DECLARE_GLOBALS_HERE
45 #include "cifsproto.h"
46 #include "cifs_debug.h"
47 #include "cifs_fs_sb.h"
49 #include <linux/key-type.h>
50 #include "cifs_spnego.h"
52 #ifdef CONFIG_CIFS_SMB2
58 bool enable_oplocks = true;
59 unsigned int linuxExtEnabled = 1;
60 unsigned int lookupCacheEnabled = 1;
61 unsigned int global_secflags = CIFSSEC_DEF;
62 /* unsigned int ntlmv2_support = 0; */
63 unsigned int sign_CIFS_PDUs = 1;
64 static const struct super_operations cifs_super_ops;
65 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
66 module_param(CIFSMaxBufSize, uint, 0);
67 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
68 "Default: 16384 Range: 8192 to 130048");
69 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
70 module_param(cifs_min_rcv, uint, 0);
71 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
73 unsigned int cifs_min_small = 30;
74 module_param(cifs_min_small, uint, 0);
75 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
77 unsigned int cifs_max_pending = CIFS_MAX_REQ;
78 module_param(cifs_max_pending, uint, 0444);
79 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
80 "Default: 32767 Range: 2 to 32767.");
81 module_param(enable_oplocks, bool, 0644);
82 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
84 extern mempool_t *cifs_sm_req_poolp;
85 extern mempool_t *cifs_req_poolp;
86 extern mempool_t *cifs_mid_poolp;
88 struct workqueue_struct *cifsiod_wq;
91 * Bumps refcount for cifs super block.
92 * Note that it should be only called if a referece to VFS super block is
93 * already held, e.g. in open-type syscalls context. Otherwise it can race with
94 * atomic_dec_and_test in deactivate_locked_super.
97 cifs_sb_active(struct super_block *sb)
99 struct cifs_sb_info *server = CIFS_SB(sb);
101 if (atomic_inc_return(&server->active) == 1)
102 atomic_inc(&sb->s_active);
106 cifs_sb_deactive(struct super_block *sb)
108 struct cifs_sb_info *server = CIFS_SB(sb);
110 if (atomic_dec_and_test(&server->active))
111 deactivate_super(sb);
115 cifs_read_super(struct super_block *sb)
118 struct cifs_sb_info *cifs_sb;
119 struct cifs_tcon *tcon;
122 cifs_sb = CIFS_SB(sb);
123 tcon = cifs_sb_master_tcon(cifs_sb);
125 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
126 sb->s_flags |= MS_POSIXACL;
128 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
129 sb->s_maxbytes = MAX_LFS_FILESIZE;
131 sb->s_maxbytes = MAX_NON_LFS;
133 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
134 sb->s_time_gran = 100;
136 sb->s_magic = CIFS_MAGIC_NUMBER;
137 sb->s_op = &cifs_super_ops;
138 sb->s_bdi = &cifs_sb->bdi;
139 sb->s_blocksize = CIFS_MAX_MSGSIZE;
140 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
141 inode = cifs_root_iget(sb);
149 sb->s_d_op = &cifs_ci_dentry_ops;
151 sb->s_d_op = &cifs_dentry_ops;
153 sb->s_root = d_make_root(inode);
159 #ifdef CONFIG_CIFS_NFSD_EXPORT
160 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
161 cifs_dbg(FYI, "export ops supported\n");
162 sb->s_export_op = &cifs_export_ops;
164 #endif /* CONFIG_CIFS_NFSD_EXPORT */
169 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
173 static void cifs_kill_sb(struct super_block *sb)
175 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
177 cifs_umount(cifs_sb);
181 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
183 struct super_block *sb = dentry->d_sb;
184 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
185 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
186 struct TCP_Server_Info *server = tcon->ses->server;
193 * PATH_MAX may be too long - it would presumably be total path,
194 * but note that some servers (includinng Samba 3) have a shorter
197 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
199 buf->f_namelen = PATH_MAX;
200 buf->f_files = 0; /* undefined */
201 buf->f_ffree = 0; /* unlimited */
203 if (server->ops->queryfs)
204 rc = server->ops->queryfs(xid, tcon, buf);
210 static int cifs_permission(struct inode *inode, int mask)
212 struct cifs_sb_info *cifs_sb;
214 cifs_sb = CIFS_SB(inode->i_sb);
216 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
217 if ((mask & MAY_EXEC) && !execute_ok(inode))
221 } else /* file mode might have been restricted at mount time
222 on the client (above and beyond ACL on servers) for
223 servers which do not support setting and viewing mode bits,
224 so allowing client to check permissions is useful */
225 return generic_permission(inode, mask);
228 static struct kmem_cache *cifs_inode_cachep;
229 static struct kmem_cache *cifs_req_cachep;
230 static struct kmem_cache *cifs_mid_cachep;
231 static struct kmem_cache *cifs_sm_req_cachep;
232 mempool_t *cifs_sm_req_poolp;
233 mempool_t *cifs_req_poolp;
234 mempool_t *cifs_mid_poolp;
236 static struct inode *
237 cifs_alloc_inode(struct super_block *sb)
239 struct cifsInodeInfo *cifs_inode;
240 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
243 cifs_inode->cifsAttrs = 0x20; /* default */
244 cifs_inode->time = 0;
246 * Until the file is open and we have gotten oplock info back from the
247 * server, can not assume caching of file data or metadata.
249 cifs_set_oplock_level(cifs_inode, 0);
250 cifs_inode->flags = 0;
251 spin_lock_init(&cifs_inode->writers_lock);
252 cifs_inode->writers = 0;
253 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
254 cifs_inode->server_eof = 0;
255 cifs_inode->uniqueid = 0;
256 cifs_inode->createtime = 0;
257 cifs_inode->epoch = 0;
258 #ifdef CONFIG_CIFS_SMB2
259 get_random_bytes(cifs_inode->lease_key, SMB2_LEASE_KEY_SIZE);
262 * Can not set i_flags here - they get immediately overwritten to zero
265 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
266 INIT_LIST_HEAD(&cifs_inode->openFileList);
267 INIT_LIST_HEAD(&cifs_inode->llist);
268 return &cifs_inode->vfs_inode;
271 static void cifs_i_callback(struct rcu_head *head)
273 struct inode *inode = container_of(head, struct inode, i_rcu);
274 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
278 cifs_destroy_inode(struct inode *inode)
280 call_rcu(&inode->i_rcu, cifs_i_callback);
284 cifs_evict_inode(struct inode *inode)
286 truncate_inode_pages_final(&inode->i_data);
288 cifs_fscache_release_inode_cookie(inode);
292 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
294 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
295 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
297 seq_puts(s, ",addr=");
299 switch (server->dstaddr.ss_family) {
301 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
304 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
305 if (sa6->sin6_scope_id)
306 seq_printf(s, "%%%u", sa6->sin6_scope_id);
309 seq_puts(s, "(unknown)");
314 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
316 if (ses->sectype == Unspecified)
319 seq_puts(s, ",sec=");
321 switch (ses->sectype) {
323 seq_puts(s, "lanman");
326 seq_puts(s, "ntlmv2");
335 seq_puts(s, "ntlmssp");
338 /* shouldn't ever happen */
339 seq_puts(s, "unknown");
348 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
350 seq_puts(s, ",cache=");
352 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
353 seq_puts(s, "strict");
354 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
357 seq_puts(s, "loose");
361 cifs_show_nls(struct seq_file *s, struct nls_table *cur)
363 struct nls_table *def;
365 /* Display iocharset= option if it's not default charset */
366 def = load_nls_default();
368 seq_printf(s, ",iocharset=%s", cur->charset);
373 * cifs_show_options() is for displaying mount options in /proc/mounts.
374 * Not all settable options are displayed but most of the important
378 cifs_show_options(struct seq_file *s, struct dentry *root)
380 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
381 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
382 struct sockaddr *srcaddr;
383 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
385 seq_printf(s, ",vers=%s", tcon->ses->server->vals->version_string);
386 cifs_show_security(s, tcon->ses);
387 cifs_show_cache_flavor(s, cifs_sb);
389 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
390 seq_puts(s, ",multiuser");
391 else if (tcon->ses->user_name)
392 seq_printf(s, ",username=%s", tcon->ses->user_name);
394 if (tcon->ses->domainName)
395 seq_printf(s, ",domain=%s", tcon->ses->domainName);
397 if (srcaddr->sa_family != AF_UNSPEC) {
398 struct sockaddr_in *saddr4;
399 struct sockaddr_in6 *saddr6;
400 saddr4 = (struct sockaddr_in *)srcaddr;
401 saddr6 = (struct sockaddr_in6 *)srcaddr;
402 if (srcaddr->sa_family == AF_INET6)
403 seq_printf(s, ",srcaddr=%pI6c",
405 else if (srcaddr->sa_family == AF_INET)
406 seq_printf(s, ",srcaddr=%pI4",
407 &saddr4->sin_addr.s_addr);
409 seq_printf(s, ",srcaddr=BAD-AF:%i",
410 (int)(srcaddr->sa_family));
413 seq_printf(s, ",uid=%u",
414 from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
415 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
416 seq_puts(s, ",forceuid");
418 seq_puts(s, ",noforceuid");
420 seq_printf(s, ",gid=%u",
421 from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
422 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
423 seq_puts(s, ",forcegid");
425 seq_puts(s, ",noforcegid");
427 cifs_show_address(s, tcon->ses->server);
430 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
431 cifs_sb->mnt_file_mode,
432 cifs_sb->mnt_dir_mode);
434 cifs_show_nls(s, cifs_sb->local_nls);
437 seq_puts(s, ",seal");
439 seq_puts(s, ",nocase");
441 seq_puts(s, ",hard");
443 seq_puts(s, ",unix");
445 seq_puts(s, ",nounix");
446 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
447 seq_puts(s, ",posixpaths");
448 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
449 seq_puts(s, ",setuids");
450 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
451 seq_puts(s, ",serverino");
452 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
453 seq_puts(s, ",rwpidforward");
454 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
455 seq_puts(s, ",forcemand");
456 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
457 seq_puts(s, ",nouser_xattr");
458 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
459 seq_puts(s, ",mapchars");
460 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
462 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
463 seq_puts(s, ",nobrl");
464 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
465 seq_puts(s, ",cifsacl");
466 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
467 seq_puts(s, ",dynperm");
468 if (root->d_sb->s_flags & MS_POSIXACL)
470 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
471 seq_puts(s, ",mfsymlinks");
472 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
474 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
475 seq_puts(s, ",nostrictsync");
476 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
477 seq_puts(s, ",noperm");
478 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
479 seq_printf(s, ",backupuid=%u",
480 from_kuid_munged(&init_user_ns,
481 cifs_sb->mnt_backupuid));
482 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
483 seq_printf(s, ",backupgid=%u",
484 from_kgid_munged(&init_user_ns,
485 cifs_sb->mnt_backupgid));
487 seq_printf(s, ",rsize=%u", cifs_sb->rsize);
488 seq_printf(s, ",wsize=%u", cifs_sb->wsize);
489 /* convert actimeo and display it in seconds */
490 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
495 static void cifs_umount_begin(struct super_block *sb)
497 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
498 struct cifs_tcon *tcon;
503 tcon = cifs_sb_master_tcon(cifs_sb);
505 spin_lock(&cifs_tcp_ses_lock);
506 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
507 /* we have other mounts to same share or we have
508 already tried to force umount this and woken up
509 all waiting network requests, nothing to do */
510 spin_unlock(&cifs_tcp_ses_lock);
512 } else if (tcon->tc_count == 1)
513 tcon->tidStatus = CifsExiting;
514 spin_unlock(&cifs_tcp_ses_lock);
516 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
517 /* cancel_notify_requests(tcon); */
518 if (tcon->ses && tcon->ses->server) {
519 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
520 wake_up_all(&tcon->ses->server->request_q);
521 wake_up_all(&tcon->ses->server->response_q);
522 msleep(1); /* yield */
523 /* we have to kick the requests once more */
524 wake_up_all(&tcon->ses->server->response_q);
531 #ifdef CONFIG_CIFS_STATS2
532 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
539 static int cifs_remount(struct super_block *sb, int *flags, char *data)
542 *flags |= MS_NODIRATIME;
546 static int cifs_drop_inode(struct inode *inode)
548 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
550 /* no serverino => unconditional eviction */
551 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
552 generic_drop_inode(inode);
555 static const struct super_operations cifs_super_ops = {
556 .statfs = cifs_statfs,
557 .alloc_inode = cifs_alloc_inode,
558 .destroy_inode = cifs_destroy_inode,
559 .drop_inode = cifs_drop_inode,
560 .evict_inode = cifs_evict_inode,
561 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
562 function unless later we add lazy close of inodes or unless the
563 kernel forgets to call us with the same number of releases (closes)
565 .show_options = cifs_show_options,
566 .umount_begin = cifs_umount_begin,
567 .remount_fs = cifs_remount,
568 #ifdef CONFIG_CIFS_STATS2
569 .show_stats = cifs_show_stats,
574 * Get root dentry from superblock according to prefix path mount option.
575 * Return dentry with refcount + 1 on success and NULL otherwise.
577 static struct dentry *
578 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
580 struct dentry *dentry;
581 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
582 char *full_path = NULL;
586 full_path = cifs_build_path_to_root(vol, cifs_sb,
587 cifs_sb_master_tcon(cifs_sb));
588 if (full_path == NULL)
589 return ERR_PTR(-ENOMEM);
591 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
593 sep = CIFS_DIR_SEP(cifs_sb);
594 dentry = dget(sb->s_root);
598 struct inode *dir = dentry->d_inode;
599 struct dentry *child;
603 dentry = ERR_PTR(-ENOENT);
606 if (!S_ISDIR(dir->i_mode)) {
608 dentry = ERR_PTR(-ENOTDIR);
612 /* skip separators */
619 while (*s && *s != sep)
622 mutex_lock(&dir->i_mutex);
623 child = lookup_one_len(p, dentry, s - p);
624 mutex_unlock(&dir->i_mutex);
627 } while (!IS_ERR(dentry));
632 static int cifs_set_super(struct super_block *sb, void *data)
634 struct cifs_mnt_data *mnt_data = data;
635 sb->s_fs_info = mnt_data->cifs_sb;
636 return set_anon_super(sb, NULL);
639 static struct dentry *
640 cifs_do_mount(struct file_system_type *fs_type,
641 int flags, const char *dev_name, void *data)
644 struct super_block *sb;
645 struct cifs_sb_info *cifs_sb;
646 struct smb_vol *volume_info;
647 struct cifs_mnt_data mnt_data;
650 cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
652 volume_info = cifs_get_volume_info((char *)data, dev_name);
653 if (IS_ERR(volume_info))
654 return ERR_CAST(volume_info);
656 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
657 if (cifs_sb == NULL) {
658 root = ERR_PTR(-ENOMEM);
662 cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
663 if (cifs_sb->mountdata == NULL) {
664 root = ERR_PTR(-ENOMEM);
668 cifs_setup_cifs_sb(volume_info, cifs_sb);
670 rc = cifs_mount(cifs_sb, volume_info);
672 if (!(flags & MS_SILENT))
673 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
679 mnt_data.vol = volume_info;
680 mnt_data.cifs_sb = cifs_sb;
681 mnt_data.flags = flags;
683 /* BB should we make this contingent on mount parm? */
684 flags |= MS_NODIRATIME | MS_NOATIME;
686 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
689 cifs_umount(cifs_sb);
694 cifs_dbg(FYI, "Use existing superblock\n");
695 cifs_umount(cifs_sb);
697 rc = cifs_read_super(sb);
703 sb->s_flags |= MS_ACTIVE;
706 root = cifs_get_root(volume_info, sb);
710 cifs_dbg(FYI, "dentry root is: %p\n", root);
714 deactivate_locked_super(sb);
716 cifs_cleanup_volume_info(volume_info);
720 kfree(cifs_sb->mountdata);
724 unload_nls(volume_info->local_nls);
729 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
732 struct inode *inode = file_inode(iocb->ki_filp);
734 rc = cifs_revalidate_mapping(inode);
738 return generic_file_read_iter(iocb, iter);
741 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
743 struct inode *inode = file_inode(iocb->ki_filp);
744 struct cifsInodeInfo *cinode = CIFS_I(inode);
748 written = cifs_get_writer(cinode);
752 written = generic_file_write_iter(iocb, from);
754 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
757 rc = filemap_fdatawrite(inode->i_mapping);
759 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
763 cifs_put_writer(cinode);
767 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
770 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
771 * the cached file length
773 if (whence != SEEK_SET && whence != SEEK_CUR) {
775 struct inode *inode = file_inode(file);
778 * We need to be sure that all dirty pages are written and the
779 * server has the newest file length.
781 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
782 inode->i_mapping->nrpages != 0) {
783 rc = filemap_fdatawait(inode->i_mapping);
785 mapping_set_error(inode->i_mapping, rc);
790 * Some applications poll for the file length in this strange
791 * way so we must seek to end on non-oplocked files by
792 * setting the revalidate time to zero.
794 CIFS_I(inode)->time = 0;
796 rc = cifs_revalidate_file_attr(file);
800 return generic_file_llseek(file, offset, whence);
803 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
806 * Note that this is called by vfs setlease with i_lock held to
807 * protect *lease from going away.
809 struct inode *inode = file_inode(file);
810 struct cifsFileInfo *cfile = file->private_data;
812 if (!(S_ISREG(inode->i_mode)))
815 /* check if file is oplocked */
816 if (((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
817 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
818 return generic_setlease(file, arg, lease);
819 else if (tlink_tcon(cfile->tlink)->local_lease &&
820 !CIFS_CACHE_READ(CIFS_I(inode)))
822 * If the server claims to support oplock on this file, then we
823 * still need to check oplock even if the local_lease mount
824 * option is set, but there are servers which do not support
825 * oplock for which this mount option may be useful if the user
826 * knows that the file won't be changed on the server by anyone
829 return generic_setlease(file, arg, lease);
834 struct file_system_type cifs_fs_type = {
835 .owner = THIS_MODULE,
837 .mount = cifs_do_mount,
838 .kill_sb = cifs_kill_sb,
841 MODULE_ALIAS_FS("cifs");
842 const struct inode_operations cifs_dir_inode_ops = {
843 .create = cifs_create,
844 .atomic_open = cifs_atomic_open,
845 .lookup = cifs_lookup,
846 .getattr = cifs_getattr,
847 .unlink = cifs_unlink,
848 .link = cifs_hardlink,
851 .rename2 = cifs_rename2,
852 .permission = cifs_permission,
853 /* revalidate:cifs_revalidate, */
854 .setattr = cifs_setattr,
855 .symlink = cifs_symlink,
857 #ifdef CONFIG_CIFS_XATTR
858 .setxattr = cifs_setxattr,
859 .getxattr = cifs_getxattr,
860 .listxattr = cifs_listxattr,
861 .removexattr = cifs_removexattr,
865 const struct inode_operations cifs_file_inode_ops = {
866 /* revalidate:cifs_revalidate, */
867 .setattr = cifs_setattr,
868 .getattr = cifs_getattr, /* do we need this anymore? */
869 .permission = cifs_permission,
870 #ifdef CONFIG_CIFS_XATTR
871 .setxattr = cifs_setxattr,
872 .getxattr = cifs_getxattr,
873 .listxattr = cifs_listxattr,
874 .removexattr = cifs_removexattr,
878 const struct inode_operations cifs_symlink_inode_ops = {
879 .readlink = generic_readlink,
880 .follow_link = cifs_follow_link,
881 .put_link = kfree_put_link,
882 .permission = cifs_permission,
883 /* BB add the following two eventually */
884 /* revalidate: cifs_revalidate,
885 setattr: cifs_notify_change, *//* BB do we need notify change */
886 #ifdef CONFIG_CIFS_XATTR
887 .setxattr = cifs_setxattr,
888 .getxattr = cifs_getxattr,
889 .listxattr = cifs_listxattr,
890 .removexattr = cifs_removexattr,
894 const struct file_operations cifs_file_ops = {
895 .read = new_sync_read,
896 .write = new_sync_write,
897 .read_iter = cifs_loose_read_iter,
898 .write_iter = cifs_file_write_iter,
900 .release = cifs_close,
904 .mmap = cifs_file_mmap,
905 .splice_read = generic_file_splice_read,
906 .llseek = cifs_llseek,
907 #ifdef CONFIG_CIFS_POSIX
908 .unlocked_ioctl = cifs_ioctl,
909 #endif /* CONFIG_CIFS_POSIX */
910 .setlease = cifs_setlease,
913 const struct file_operations cifs_file_strict_ops = {
914 .read = new_sync_read,
915 .write = new_sync_write,
916 .read_iter = cifs_strict_readv,
917 .write_iter = cifs_strict_writev,
919 .release = cifs_close,
921 .fsync = cifs_strict_fsync,
923 .mmap = cifs_file_strict_mmap,
924 .splice_read = generic_file_splice_read,
925 .llseek = cifs_llseek,
926 #ifdef CONFIG_CIFS_POSIX
927 .unlocked_ioctl = cifs_ioctl,
928 #endif /* CONFIG_CIFS_POSIX */
929 .setlease = cifs_setlease,
932 const struct file_operations cifs_file_direct_ops = {
933 /* BB reevaluate whether they can be done with directio, no cache */
934 .read = new_sync_read,
935 .write = new_sync_write,
936 .read_iter = cifs_user_readv,
937 .write_iter = cifs_user_writev,
939 .release = cifs_close,
943 .mmap = cifs_file_mmap,
944 .splice_read = generic_file_splice_read,
945 #ifdef CONFIG_CIFS_POSIX
946 .unlocked_ioctl = cifs_ioctl,
947 #endif /* CONFIG_CIFS_POSIX */
948 .llseek = cifs_llseek,
949 .setlease = cifs_setlease,
952 const struct file_operations cifs_file_nobrl_ops = {
953 .read = new_sync_read,
954 .write = new_sync_write,
955 .read_iter = cifs_loose_read_iter,
956 .write_iter = cifs_file_write_iter,
958 .release = cifs_close,
961 .mmap = cifs_file_mmap,
962 .splice_read = generic_file_splice_read,
963 .llseek = cifs_llseek,
964 #ifdef CONFIG_CIFS_POSIX
965 .unlocked_ioctl = cifs_ioctl,
966 #endif /* CONFIG_CIFS_POSIX */
967 .setlease = cifs_setlease,
970 const struct file_operations cifs_file_strict_nobrl_ops = {
971 .read = new_sync_read,
972 .write = new_sync_write,
973 .read_iter = cifs_strict_readv,
974 .write_iter = cifs_strict_writev,
976 .release = cifs_close,
977 .fsync = cifs_strict_fsync,
979 .mmap = cifs_file_strict_mmap,
980 .splice_read = generic_file_splice_read,
981 .llseek = cifs_llseek,
982 #ifdef CONFIG_CIFS_POSIX
983 .unlocked_ioctl = cifs_ioctl,
984 #endif /* CONFIG_CIFS_POSIX */
985 .setlease = cifs_setlease,
988 const struct file_operations cifs_file_direct_nobrl_ops = {
989 /* BB reevaluate whether they can be done with directio, no cache */
990 .read = new_sync_read,
991 .write = new_sync_write,
992 .read_iter = cifs_user_readv,
993 .write_iter = cifs_user_writev,
995 .release = cifs_close,
998 .mmap = cifs_file_mmap,
999 .splice_read = generic_file_splice_read,
1000 #ifdef CONFIG_CIFS_POSIX
1001 .unlocked_ioctl = cifs_ioctl,
1002 #endif /* CONFIG_CIFS_POSIX */
1003 .llseek = cifs_llseek,
1004 .setlease = cifs_setlease,
1007 const struct file_operations cifs_dir_ops = {
1008 .iterate = cifs_readdir,
1009 .release = cifs_closedir,
1010 .read = generic_read_dir,
1011 .unlocked_ioctl = cifs_ioctl,
1012 .llseek = generic_file_llseek,
1016 cifs_init_once(void *inode)
1018 struct cifsInodeInfo *cifsi = inode;
1020 inode_init_once(&cifsi->vfs_inode);
1021 init_rwsem(&cifsi->lock_sem);
1025 cifs_init_inodecache(void)
1027 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1028 sizeof(struct cifsInodeInfo),
1029 0, (SLAB_RECLAIM_ACCOUNT|
1032 if (cifs_inode_cachep == NULL)
1039 cifs_destroy_inodecache(void)
1042 * Make sure all delayed rcu free inodes are flushed before we
1046 kmem_cache_destroy(cifs_inode_cachep);
1050 cifs_init_request_bufs(void)
1052 size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
1053 #ifdef CONFIG_CIFS_SMB2
1055 * SMB2 maximum header size is bigger than CIFS one - no problems to
1056 * allocate some more bytes for CIFS.
1058 max_hdr_size = MAX_SMB2_HDR_SIZE;
1060 if (CIFSMaxBufSize < 8192) {
1061 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1062 Unicode path name has to fit in any SMB/CIFS path based frames */
1063 CIFSMaxBufSize = 8192;
1064 } else if (CIFSMaxBufSize > 1024*127) {
1065 CIFSMaxBufSize = 1024 * 127;
1067 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1070 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1071 CIFSMaxBufSize, CIFSMaxBufSize);
1073 cifs_req_cachep = kmem_cache_create("cifs_request",
1074 CIFSMaxBufSize + max_hdr_size, 0,
1075 SLAB_HWCACHE_ALIGN, NULL);
1076 if (cifs_req_cachep == NULL)
1079 if (cifs_min_rcv < 1)
1081 else if (cifs_min_rcv > 64) {
1083 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1086 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1089 if (cifs_req_poolp == NULL) {
1090 kmem_cache_destroy(cifs_req_cachep);
1093 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1094 almost all handle based requests (but not write response, nor is it
1095 sufficient for path based requests). A smaller size would have
1096 been more efficient (compacting multiple slab items on one 4k page)
1097 for the case in which debug was on, but this larger size allows
1098 more SMBs to use small buffer alloc and is still much more
1099 efficient to alloc 1 per page off the slab compared to 17K (5page)
1100 alloc of large cifs buffers even when page debugging is on */
1101 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1102 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1104 if (cifs_sm_req_cachep == NULL) {
1105 mempool_destroy(cifs_req_poolp);
1106 kmem_cache_destroy(cifs_req_cachep);
1110 if (cifs_min_small < 2)
1112 else if (cifs_min_small > 256) {
1113 cifs_min_small = 256;
1114 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1117 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1118 cifs_sm_req_cachep);
1120 if (cifs_sm_req_poolp == NULL) {
1121 mempool_destroy(cifs_req_poolp);
1122 kmem_cache_destroy(cifs_req_cachep);
1123 kmem_cache_destroy(cifs_sm_req_cachep);
1131 cifs_destroy_request_bufs(void)
1133 mempool_destroy(cifs_req_poolp);
1134 kmem_cache_destroy(cifs_req_cachep);
1135 mempool_destroy(cifs_sm_req_poolp);
1136 kmem_cache_destroy(cifs_sm_req_cachep);
1140 cifs_init_mids(void)
1142 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1143 sizeof(struct mid_q_entry), 0,
1144 SLAB_HWCACHE_ALIGN, NULL);
1145 if (cifs_mid_cachep == NULL)
1148 /* 3 is a reasonable minimum number of simultaneous operations */
1149 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1150 if (cifs_mid_poolp == NULL) {
1151 kmem_cache_destroy(cifs_mid_cachep);
1159 cifs_destroy_mids(void)
1161 mempool_destroy(cifs_mid_poolp);
1162 kmem_cache_destroy(cifs_mid_cachep);
1170 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1171 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1172 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1173 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1174 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1176 * Initialize Global counters
1178 atomic_set(&sesInfoAllocCount, 0);
1179 atomic_set(&tconInfoAllocCount, 0);
1180 atomic_set(&tcpSesAllocCount, 0);
1181 atomic_set(&tcpSesReconnectCount, 0);
1182 atomic_set(&tconInfoReconnectCount, 0);
1184 atomic_set(&bufAllocCount, 0);
1185 atomic_set(&smBufAllocCount, 0);
1186 #ifdef CONFIG_CIFS_STATS2
1187 atomic_set(&totBufAllocCount, 0);
1188 atomic_set(&totSmBufAllocCount, 0);
1189 #endif /* CONFIG_CIFS_STATS2 */
1191 atomic_set(&midCount, 0);
1192 GlobalCurrentXid = 0;
1193 GlobalTotalActiveXid = 0;
1194 GlobalMaxActiveXid = 0;
1195 spin_lock_init(&cifs_tcp_ses_lock);
1196 spin_lock_init(&cifs_file_list_lock);
1197 spin_lock_init(&GlobalMid_Lock);
1199 if (cifs_max_pending < 2) {
1200 cifs_max_pending = 2;
1201 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1202 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1203 cifs_max_pending = CIFS_MAX_REQ;
1204 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1208 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1211 goto out_clean_proc;
1214 rc = cifs_fscache_register();
1216 goto out_destroy_wq;
1218 rc = cifs_init_inodecache();
1220 goto out_unreg_fscache;
1222 rc = cifs_init_mids();
1224 goto out_destroy_inodecache;
1226 rc = cifs_init_request_bufs();
1228 goto out_destroy_mids;
1230 #ifdef CONFIG_CIFS_UPCALL
1231 rc = register_key_type(&cifs_spnego_key_type);
1233 goto out_destroy_request_bufs;
1234 #endif /* CONFIG_CIFS_UPCALL */
1236 #ifdef CONFIG_CIFS_ACL
1237 rc = init_cifs_idmap();
1239 goto out_register_key_type;
1240 #endif /* CONFIG_CIFS_ACL */
1242 rc = register_filesystem(&cifs_fs_type);
1244 goto out_init_cifs_idmap;
1248 out_init_cifs_idmap:
1249 #ifdef CONFIG_CIFS_ACL
1251 out_register_key_type:
1253 #ifdef CONFIG_CIFS_UPCALL
1254 unregister_key_type(&cifs_spnego_key_type);
1255 out_destroy_request_bufs:
1257 cifs_destroy_request_bufs();
1259 cifs_destroy_mids();
1260 out_destroy_inodecache:
1261 cifs_destroy_inodecache();
1263 cifs_fscache_unregister();
1265 destroy_workqueue(cifsiod_wq);
1274 cifs_dbg(NOISY, "exit_cifs\n");
1275 unregister_filesystem(&cifs_fs_type);
1276 cifs_dfs_release_automount_timer();
1277 #ifdef CONFIG_CIFS_ACL
1280 #ifdef CONFIG_CIFS_UPCALL
1281 unregister_key_type(&cifs_spnego_key_type);
1283 cifs_destroy_request_bufs();
1284 cifs_destroy_mids();
1285 cifs_destroy_inodecache();
1286 cifs_fscache_unregister();
1287 destroy_workqueue(cifsiod_wq);
1291 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1292 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1294 ("VFS to access servers complying with the SNIA CIFS Specification "
1295 "e.g. Samba and Windows");
1296 MODULE_VERSION(CIFS_VERSION);
1297 module_init(init_cifs)
1298 module_exit(exit_cifs)